技術者が Web サイトに接続できないユーザーをサポートしています。技術者は、ワークステーションのデフォルト ゲートウェイと DNS サーバーに ping を実行しようとします。トラブルシューティング方法論によると、これは次の例です。
正解:C
This is because a top-to-bottom approach is a troubleshooting methodology that starts from the highest layer of the OSI model and works its way down to the lowest layer. The technician is using this approach by first testing the network layer connectivity with the ping command, which uses the ICMP protocol. If the ping is successful, the technician can move on to the next layer, such as the transport layer or the application layer. If the ping fails, the technician can troubleshoot the lower layers, such as the data link layer or the physical layer.
The source of this answer is the Cisco ENCOR v1.1 course, module 10, lesson 10.3: Applying Troubleshooting Methodologies.